package com.yy.studyspringboot.utils;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

/**
 * 
 * @author zsp
 * @date 2017年8月16日
 */
public class SpringContextUtil implements ApplicationContextAware {

	/**
	 * Spring应用上下文环境
	 */
	private static ApplicationContext applicationContext;

	/**
	 * 实现ApplicationContextAware接口的回调方法，设置上下文环境
	 * 
	 * @param applicationContext
	 */
	@Override
	public void setApplicationContext(ApplicationContext applicationContext) {
		SpringContextUtil.applicationContext = applicationContext;
	}

	/**
	 * @return ApplicationContext
	 */
	public static ApplicationContext getApplicationContext() {
		return applicationContext;
	}

	/**
	 * 获取对象
	 * 
	 * @param name
	 * @return Object
	 * @throws BeansException
	 */
	public static Object getBean(String name) {
		return applicationContext.getBean(name);
	}

	/**
	 * 根据类型返回指定的Bean
	 * @param clazz
	 * @return
	 */
	public static <T> T getBean(Class<T> clazz) {
        return applicationContext.getBean(clazz);
    }

    /**
     * 通过name和clazz返回指定的Bean
     * @param name
     * @param clazz
     * @return
     * @throws BeansException
     */
    public static <T> T getBean(String name, Class<T> clazz) throws BeansException {
        return applicationContext.getBean(name, clazz);
    }
}